Hi all, I just picked up an 89 DM600 Glider Kit, it has an old (orange paint) 285 2 valve in it. The engine was a pedigree from Mack when the truck was put together in 89. My problem is once the enigine is warm it will start to idle up and down (common for an old 2 valve) but sometimes it will jump almost like you stab the fuel peddle really quick, it never goes over 800 rpm but its quite annoying. It has an AMBAC pump on it and it runs fine anything over 800 RPM's. Low idle is where it is giving me a problem, it does not go low enough to stall but it idles like crap when its warm...any suggestions?
